YINGBA · CARBIDE CNC CUTTING TOOLS
Corn End Mills for PCB & Composites
Diamond-cut flute geometry for PCB depaneling and composite board cutting.
Corn / diamond-cut flute · 3.175 to 12 mm shanks
Quick answer: a corn end mill — also called a router bit or diamond-cut bit in PCB work — has a toothed flute that breaks the cut into small bites instead of one continuous shear. That reduces the cutting force and the heat, which is why it is the standard geometry for depaneling fibre-reinforced PCB material and for cutting fibreglass, epoxy, carbon fibre and metal-clad substrate boards without delaminating the edge.
Materials and machines
- Materials: Fibreglass board, aluminium substrate board, copper substrate board, epoxy board, bakelite board, carbon fibre board, composite board, acrylic, two-colour engraving board
- Machines: PCB CNC depaneling machines, CNC engraving machines, engraving-milling machines, compact CNC milling machines, vertical machining centres
Feed rate, spindle speed and depth of cut must be matched to the tool diameter, material, machine rigidity and workholding. These are application-specific and are confirmed for each order.
Complete size list
Toothed flute geometry with small cutting diameters for PCB depaneling and fine composite work.
Corn (diamond-cut) end mill
The toothed flute lowers cutting force and heat, which protects the edge of laminated and fibre-reinforced boards.
| Shank (mm) | Cutting Ø (mm) | Cutting length (mm) | Overall length (mm) |
|---|---|---|---|
| 3.175 | 0.6 – 3.175 | 9.5 – 22 | 38 – 45 |
| 4 | 4 | 17 – 22 | 40 – 45 |
| 5 | 5 | 22 – 32 | 50 – 60 |
| 6 | 6 | 17 – 42 | 100 – 120 |
| 8 | 8 | 22 – 42 | 50 – 70 |
| 10 | 10 | 25 – 50 | 65 – 100 |
| 12 | 12 | 32 – 50 | 75 – 100 |
Frequently asked questions
What is a corn end mill used for?
PCB depaneling and cutting fibre-reinforced and composite boards: fibreglass, epoxy, carbon fibre, aluminium and copper substrate board, bakelite and composite sheet.
Why does a corn bit cut composites better than a standard end mill?
The toothed flute takes many small bites instead of one continuous shear. That lowers cutting force and heat, which is what causes delamination and burrs on fibre-reinforced and metal-clad boards.
Can it be used on wood or plastic?
The catalogue lists it for fibreglass, aluminium and copper substrate board, epoxy, bakelite, carbon fibre, composite board, acrylic and two-colour engraving board.
Which machines is it used on?
PCB CNC depaneling machines, CNC engraving machines, engraving-milling machines, compact CNC milling machines and vertical machining centres.
Can I order a small cutting diameter?
Yes. Cutting diameters from 0.6 mm are listed within the 3.175 mm shank family, and custom sizes can be produced to your drawing.
Related guides and tools
Need a matched tool recommendation?
Tell us the material, the operation and your machine. YINGBA will review the requirement and prepare a B2B quotation.